[gnome-continuous-yocto/gnomeostree-3.22-krogoth: 116/246] lib/oe/recipeutils: fix patch_recipe*() with empty input

[Emmanuele Bassi <ebassi src gnome org>]

commit bd2cc670bed358fde65eaf36e0583fe4b0027ebc
Author: Paul Eggleton <paul eggleton linux intel com>
Date:   Mon Jul 25 20:47:17 2016 +1200

    lib/oe/recipeutils: fix patch_recipe*() with empty input
    
    If you supplied an empty file to patch_recipe() (or an empty list to
    patch_recipe_lines()) then the result was IndexError because the code
    checking to see if it needed to add an extra line of padding didn't
    check to see if there were in fact any lines before trying to access the
    last line.
    
    Fixes [YOCTO #9972].
    
    (From OE-Core rev: 92a73e870478ddb2a2d137e3fff28828809bec2e)
    
    (From OE-Core rev: 5ce14441f02894e68881807138e8f45074900ba2)
    
    Signed-off-by: Paul Eggleton <paul eggleton linux intel com>
    Signed-off-by: Richard Purdie <richard purdie linuxfoundation org>
    Signed-off-by: Armin Kuster <akuster808 gmail com>
    Signed-off-by: Richard Purdie <richard purdie linuxfoundation org>

 meta/lib/oe/recipeutils.py |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/meta/lib/oe/recipeutils.py b/meta/lib/oe/recipeutils.py
index 6c7adb5..304989c 100644
--- a/meta/lib/oe/recipeutils.py
+++ b/meta/lib/oe/recipeutils.py
@@ -255,7 +255,7 @@ def patch_recipe_file(fn, values, patch=False, relpath=''):
     changed, tolines = bb.utils.edit_metadata(fromlines, varlist, patch_recipe_varfunc, match_overrides=True)
 
     if remainingnames:
-        if tolines[-1].strip() != '':
+        if tolines and tolines[-1].strip() != '':
             tolines.append('\n')
         for k in remainingnames.keys():
             outputvalue(k, tolines)